1212251200000 has 240 divisors, whose sum is σ = 3061850825880. Its totient is φ = 479395840000.

The previous prime is 1212251199979. The next prime is 1212251200009. The reversal of 1212251200000 is 21522121.

It is a happy number.

It can be written as a sum of positive squares in 12 ways, for example, as 382636267776 + 829614932224 = 618576^2 + 910832^2 .

It is a Harshad number since it is a multiple of its sum of digits (16).

It is not an unprimeable number, because it can be changed into a prime (1212251200009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 142395744 + ... + 142404256.

Almost surely, 2^{1212251200000} is an apocalyptic number.

1212251200000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1212251200000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1530925412940).

1212251200000 is an abundant number, since it is smaller than the sum of its proper divisors (1849599625880).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1212251200000 is an frugal number, since it uses more digits than its factorization.

1212251200000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8645 (or 8609 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 16.

Adding to 1212251200000 its reverse (21522121), we get a palindrome (1212272722121).

The spelling of 1212251200000 in words is "one trillion, two hundred twelve billion, two hundred fifty-one million, two hundred thousand".